Ions ago I read a Ray B. story about a guy that went back in time and accidentally stepped on a cockroach. The incident caused a chain of events that eventually led to rewriting history and Hitler was king of the world.

Can somebody help me out with the name of the story?

Butterfly! "Sound of Thunder" ~ Golden Apples of the Sun (ss collection).

Wow, I've seen moth before, but that's definitely the first cockroach!

....and so Chuck was burned on the stake by the hardcore r.b fans because he mistuke a butterfly for a cockroach